Fluid coupling



FIG. 1 is perspective view of the fluid coupling.

FIG. 2 is a top view of the fluid coupling.

FIG. 3 is a side view of the fluid coupling.

FIG. 4 is a first end view of the fluid coupling; and,

FIG. 5 is a second end view of the fluid coupling.

The broken lines depict portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a fluid coupling, as shown and described. 